CN114353937A - Optical sensor and terminal equipment - Google Patents
Optical sensor and terminal equipment Download PDFInfo
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- CN114353937A CN114353937A CN202111637917.9A CN202111637917A CN114353937A CN 114353937 A CN114353937 A CN 114353937A CN 202111637917 A CN202111637917 A CN 202111637917A CN 114353937 A CN114353937 A CN 114353937A
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- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
Abstract
The application provides an optical sensor, which comprises at least one optical sensor sub-module, wherein each optical sensor sub-module comprises a first optical detector, a second optical detector, a first linear polarizer, a second linear polarizer, a first phase delay film and a second phase delay film, the first optical detector is used for obtaining the light intensity of first mixed light after mixed light passes through the first phase delay film and the first linear polarizer, the second optical detector is used for obtaining the light intensity of second mixed light after the mixed light passes through the second phase delay film and the second linear polarizer, the mixed light comprises a first light ray and a second light ray, after the mixed light passes through the second linear polarizer, the first light ray is filtered so that the difference between the light intensity of the first mixed light and the light intensity of the second mixed light is the light intensity of the light ray after the first light ray passes through the first retardation film and the first linear polarizer. The application also provides a terminal device.
Description
The present application claims priority from the chinese patent office filed on 22/8/2017, having application number 201710732235.3 and entitled "optical sensor and terminal device", which is incorporated herein by reference in its entirety. For the sake of brevity only, the entire contents of which are not repeated in the text of this document.
Technical Field
The application relates to the field of optical sensors, in particular to an optical sensor and a terminal device.
Background
In order to realize that a screen performs adaptive brightness adjustment according to ambient light intensity, an ambient light sensor needs to be configured to realize light detection in the current mobile phone or wearable device. With the requirements of simplified structure, beautiful appearance and the like, the optical sensor needs to be placed at the back of the screen to realize the full-screen display effect. That is to say that what ambient light sensor received is not only the natural ambient light that sees through display screen such as OLED screen, still can have the non-ambient light of display screen self emission, for example unpolarized light, and non-ambient light and the ambient light that sees through the display screen are received by the light sensor of below simultaneously and cause the light detection interference, lead to ambient light can't be detected by the accuracy.
Disclosure of Invention
The embodiment of the application provides an optical sensor for solve the problem that environment light can not be accurately detected due to light detection interference in the prior art.
In a first aspect, the present application provides a light sensor comprising at least one light sensor sub-module, each of said light sensor sub-modules comprising a first light detector, a second light detector, a first linear polarizer, a second linear polarizer, a first phase retardation film, and a second phase retardation film; wherein the first photodetector and the second photodetector are adjacently disposed; the first linear polarizer is positioned above the first photodetector; the second linear polarizer is positioned above the second photodetector, the first phase retardation film is positioned above the first linear polarizer, and the two-phase retardation film is positioned above the second linear polarizer; the first light detector is used for acquiring the light intensity of the first mixed light after the mixed light passes through the first phase retardation film and the first linear polarizer, the second light detector is used for acquiring the light intensity of the second mixed light after the mixed light passes through the second phase retardation film and the second linear polarizer, wherein the mixed light comprises a first light and a second light, the mixed light passes through the second linear polarizer, first light is filtered for the difference of the luminous intensity of first mixed light with the luminous intensity of second mixed light is first light passes through first delay diaphragm and the luminous intensity of the light behind the first line polaroid light sensor can filter the entering of other light except natural environment light, avoids detecting and receives the interference and lead to the testing result inaccurate. The delay module can convert the first light ray into the light ray with the circular polarization. Wherein the first and second light detectors may be interconnected for robustness. In order to reduce the packaging volume of the light sensor and the sensing precision of light rays, the first linear polarizer and the second linear polarizer are positioned at the same layer.
The first phase delay diaphragm and the second phase delay diaphragm are integrally formed or are respectively formed. If the first and second photodetectors have the same height in the vertical direction, the first and second phase retardation films may be a complete film covering the first and second photodetectors. If the first optical detector and the second optical detector have height difference, the first phase delay diaphragm and the second phase delay diaphragm can be respectively arranged, so that the assembly modes of the first phase delay diaphragm and the second phase delay diaphragm, the first optical detector and the second optical detector can be more flexibly arranged, and the first phase delay diaphragm and the second phase delay diaphragm are integrally formed, so that the processing flow can be reduced.
The first light is circularly polarized light formed after ambient light passes through a display screen provided with a circular polarizing film; the second light ray is a light ray emitted by a backlight lamp of the display screen. The influence of ambient light other than the display screen on the brightness of the display screen can be detected by the light sensor.
The polarization direction of the first linear polarizer is consistent with the polarization direction of a first ray before passing through the first linear polarizer, and the polarization direction of the first ray is orthogonal to the direction of the second polarizer. Therefore, the light entering the first light sensor group and the light entering the second light sensor group generate a difference value, and the real intensity of the light needing to be detected is obtained through the difference value of the light intensity.
The first light is circularly polarized light, the first light is converted into first linearly polarized light with the same polarization direction as that of the first linear polarizer after passing through the first phase delay membrane, the first light is converted into second linearly polarized light orthogonal to the polarization direction of the second linear polarizer after passing through the second phase delay membrane, and therefore the second linearly polarized light is filtered when passing through the second linear polarizer; the second light is unpolarized light, the second light passes through the first phase delay membrane and then passes through the first linear polarizer to form third linearly polarized light, the second light passes through the second phase delay membrane and then passes through the second linear polarizer to form fourth linearly polarized light, the first mixed light comprises the first linearly polarized light and the third linearly polarized light, the second mixed light comprises the fourth linearly polarized light, the light intensity of the third linearly polarized light is the same as that of the fourth linearly polarized light, and therefore the difference value of the first mixed light intensity and the second mixed light intensity is the light intensity of the first linearly polarized light obtained after the mixed light passes through the first phase delay membrane and the first linear polarizer; further, the light sensor can accurately detect the light intensity of the first light entering the light sensor, and the influence of the second light on the detection can be avoided.
The optical sensor further comprises a processor, and the processor is configured to obtain a sum of intensities of the first light and the second light of the first optical detector and a light intensity of the second light of the second optical detector, and output a difference between the light intensity of the first optical detector and the light intensity detected by the second optical detector. The calculation of the sensed value of light by the processor has resulted in the intensity of light that needs to be detected. The processor is arranged in the first optical detector or the second optical detector or on a circuit board accommodated in the optical sensor, the specific position is not limited, and the design of the actual space in the optical sensor is combined; of course, the light sensor may be disposed outside the light sensor, for example, in a processor of the terminal.
The optical sensor sub-modules are arranged in a matrix, and the first optical detectors and the second optical detectors are arranged in a staggered mode in the matrix formed by the optical sensor sub-modules. The light intensity detected by the optical sensor is the sum of the light intensities detected by the optical sensor sub-modules, and the quantity is designed and arranged according to the actual requirements of the optical sensor, so that a better detection effect is achieved.
The application provides a light sensor, which comprises at least one light sensor sub-module, wherein each light sensor sub-module comprises a first light detector and a second light detector which is arranged adjacent to the first light detector; a first linear polarizer located above the first photodetector; a second linear polarizer located above the second photodetector, the first photodetector being configured to obtain a first mixed light intensity of the mixed light after passing through the first linear polarizer, the second light detector is used for acquiring second mixed light intensity of the mixed light after the mixed light passes through the second linear polarizer, wherein the mixed light comprises a first light and a second light, the first light is linearly polarized light, the second light ray is unpolarized light, the first light ray has the same polarization direction as the first linear polarizer and is orthogonal to the polarization direction of the second linear polarizer, the first light is filtered by the second linear polarizer, the second light is converted into linearly polarized light after passing through the first linear polarizer and the second linear polarizer, and the difference value of the first mixed light intensity and the second mixed light intensity is the light intensity of the first light ray passing through the first linear polarizer. The optical sensor of the embodiment of the application can directly detect the light intensity of linearly polarized light entering the optical sensor.
In a second aspect, the present application discloses a light sensor comprising at least one light sensor sub-module, each of the light sensor sub-modules of the present application comprising a first light detector, a second light detector, a first linear polarizer, a second linear polarizer, a first phase retardation film, and a second phase retardation film, wherein:
the first optical detector and the second optical detector are arranged adjacently;
a first linear polarizer, herein positioned above a first photodetector, herein;
a second linear polarizer, in the present application, located above the second photodetector in the present application,
a first phase retardation film disposed over a first linear polarizer;
a second phase retardation film provided over the second linear polarizer;
the first light detector of this application is used for acquireing the luminous intensity of the first mixed light behind the mixed light process this application first phase delay diaphragm and this application first line polaroid, this application second light detector is used for acquireing the luminous intensity of the second mixed light behind this application mixed light process this application second phase delay diaphragm and this application second line polaroid, wherein, this application mixed light includes first light and second light, this application mixed light is behind this application second line polaroid, this application first light is filtered, make the luminous intensity of this application first mixed light and the difference of this application second mixed light's luminous intensity be the luminous intensity of this application first light through this application first delay diaphragm and this application first line polaroid after the light.
In a first implementation manner of the second aspect, the fast axis direction of the first phase retardation film coincides with the fast axis direction of the second phase retardation film; or the slow axis direction of the first phase retardation film is coincident with the slow axis direction of the second phase retardation film;
the polarization direction of the first linear polarizer is consistent with the polarization direction of first linearly polarized light obtained after the first light passes through the first phase delay film, and the polarization direction of the first light is orthogonal to the polarization direction of the second polarizer.
In a second implementation manner of the second aspect, the fast axis direction of the first phase retardation film is orthogonal to the fast axis direction of the second phase retardation film; or the slow axis direction of the first phase retardation film is orthogonal to the slow axis direction of the second phase retardation film;
the polarization direction of the first linear polarizer is consistent with the polarization direction of first linearly polarized light obtained after the first light passes through the first phase delay membrane, and the polarization direction of the first light is consistent with the polarization direction of the second polarizer.
The first and second implementation manners of the second aspect can both achieve the effect of filtering the first light mentioned in the second aspect.
Based on the second aspect and various implementation manners in the second aspect, in a third implementation manner, the first light is circularly polarized light formed after ambient light passes through the display screen provided with the circularly polarizing plate;
the second light is light emitted by a light-emitting component of the display screen. Wherein the light emitting components may be self-emitting pixels (e.g., pixels of an OLED screen); or it may be some backlight component, for example, a backlight module (such as an LED) in an LCD screen; or other various components for emitting light.
In a fourth implementation form, based on the second aspect and various implementation forms of the second aspect, the first phase retardation film and the second phase retardation film are integrally formed or separately formed.
In a fifth implementation manner, based on the second aspect and various implementation manners of the second aspect, both the first phase retardation film and the second phase retardation film are 1/4 wave plates.
Based on the second aspect and various implementation manners of the second aspect, in a sixth implementation manner, the plurality of light sensor sub-modules are arranged in a matrix, and the first light detectors and the second light detectors are arranged in a staggered manner in the matrix formed by the plurality of light sensor sub-modules.
Based on the second aspect and various implementation manners of the second aspect, in a seventh implementation manner, the optical sensor further includes a processor, and the processor is configured to obtain a sum of intensities of the first light and the second light of the first optical detector and a light intensity of the second light of the second optical detector, and output a difference value between the light intensity of the first optical detector and the light intensity detected by the second optical detector.
Based on the second aspect and various implementation manners of the second aspect, in an eighth implementation manner, the processor is disposed on one side or a bottom of the first light detector or the second light detector, or is connected to the light sensor through a circuit board.
In a third aspect, the present application further discloses a light sensor comprising at least one light sensor sub-module, each of the light sensor sub-modules comprising a first light detector, a second light detector, a first linear polarizer, a second linear polarizer, a first phase retardation film, and a second phase retardation film, wherein:
the first light detector and the second light detector are arranged adjacently;
the first linear polarizer is positioned above the first light detector;
the second linear polarizer is positioned above the second photodetector,
the first phase delay film is positioned above the first linear polarizer;
the second phase delay diaphragm is positioned above the second linear polarizer;
the first optical detector is used for acquiring the light intensity of first mixed light after the mixed light passes through the first phase retardation film and the first linear polarizer, and the second optical detector is used for acquiring the light intensity of second mixed light after the mixed light passes through the second phase retardation film and the second linear polarizer;
wherein a fast axis direction of the first phase retardation film coincides with a fast axis direction of the second phase retardation film; or the slow axis direction of the first phase retardation film coincides with the slow axis direction of the second phase retardation film;
the polarization direction of the first linear polarizer is consistent with the polarization direction of the first light after passing through the first phase retardation film, and the polarization direction of the first light is orthogonal to the polarization direction of the second polarizer.
In a fourth aspect, the present application further discloses a light sensor, comprising: at least one light sensor sub-module, each of the light sensor sub-modules comprising a first light detector, a second light detector, a first linear polarizer, a second linear polarizer, a first phase retardation film, and a second phase retardation film, wherein:
the first light detector and the second light detector are arranged adjacently;
the first linear polarizer is positioned above the first light detector;
the second linear polarizer is positioned above the second photodetector,
the first phase delay film is positioned above the first linear polarizer;
the second phase delay diaphragm is positioned above the second linear polarizer;
the first optical detector is used for acquiring the light intensity of first mixed light after the mixed light passes through the first phase retardation film and the first linear polarizer, and the second optical detector is used for acquiring the light intensity of second mixed light after the mixed light passes through the second phase retardation film and the second linear polarizer;
a fast axis direction of the first phase retardation film is orthogonal to a fast axis direction of the second phase retardation film; or the slow axis direction of the first phase retardation film is orthogonal to the slow axis direction of the second phase retardation film;
the polarization direction of the first linear polarizer is consistent with the polarization direction of first linearly polarized light obtained after the first light passes through the first phase delay membrane, and the polarization direction of the first light is consistent with the polarization direction of the second polarizer.
Specific implementation of the third and fourth aspects may refer to various implementation manners in the second aspect, and are not described herein.
In a fifth aspect, the present application provides a terminal device, including the display screen, the display screen includes phase retardation film, linear polarization piece and transparent cover, still includes the light sensor introduced in above-mentioned each aspect and various implementation modes, the second light that mixes light and display screen self light after for ambient light through the display screen forms mixes, the light sensor output the luminous intensity of ambient light is for terminal device in order to adjust the luminance of display screen. The light sensor outputs the light intensity of the ambient light to the terminal device to adjust the brightness of the display screen, so that the sensing precision is ensured, and the display screen can correctly adjust the display light intensity. The terminal equipment can accurately detect the light intensity of external environment light through the optical sensor, and the influence of the light of the terminal equipment on the detection effect is avoided.
The optical sensor further comprises a processor, and the processor is used for acquiring the sum of the intensities of the first light and the second light of the first optical detector and the light intensity of the second light of the second optical detector, and outputting the difference value of the light intensity of the first optical detector and the light intensity detected by the second optical detector. The processor calculates the sensed value of the light to obtain the intensity of the light to be detected.
The terminal equipment comprises a circuit board, the processor is arranged on the circuit board, or the processor is arranged in the optical sensor, the specific position is not limited, and the terminal equipment is designed according to actual requirements.
The light sensor converts ambient light and other interference light, namely two lights with different attributes, into polarized light of the same type, and then obtains and generates a light intensity difference through the first light detector and the second light detector, wherein the light intensity difference is the light intensity which is required to be converted by the ambient light. Therefore, the intensity of other light except the natural environment light acquired by the light sensor can be prevented from being output, and the detection result is prevented from being inaccurate due to interference.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
FIG. 1 is a schematic side view of one embodiment of a light sensor as described herein;
FIG. 2A is a schematic view of the light conversion and orientation of the light sensor shown in FIG. 1;
FIG. 2B is a schematic diagram of light conversion and orientation of a light sensor according to another embodiment;
FIG. 3 is a schematic view of another embodiment of a light sensor described herein;
FIG. 4 is a schematic diagram of light conversion and orientation of the light sensor shown in FIG. 3;
FIG. 5 is a schematic diagram of a terminal device according to the present application;
FIG. 6 is a schematic view of the terminal device shown in FIG. 5 illustrating light conversion and orientation;
FIG. 7 is a schematic diagram of one manner in which a processor is disposed within the light sensor in the terminal device shown in FIG. 5;
FIG. 8 is a schematic diagram of a matrix array of multiple light sensor sub-modules.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings.
For a better explanation of the present application, some terms referred to in the present application will be explained below.
Unpolarized light: light waves are transverse waves, i.e. the direction of vibration of the light wave vector is perpendicular to the direction of propagation of light. Generally, the light source emits light waves whose vibration of the light wave vector is randomly oriented in the direction perpendicular to the propagation direction of the light, but statistically, on average, the distribution of the light wave vector is considered to be equally probable in all possible directions in space, and the sum of the light wave vector and the light wave vector is symmetrical to the propagation direction of the light, that is, the light vector has axial symmetry, is uniformly distributed, and has the same vibration amplitude in all directions, which is natural light, also called unpolarized light.
Linearly polarized light: the plane formed by the vibration direction and the light wave advancing direction is called a vibration plane, and the vibration plane of light is limited to a certain fixed direction and is called linearly polarized light.
Circularly polarized light: the locus of the light vector end points is a circle, namely, the light vector rotates continuously, the size of the light vector is constant, but the direction of the light vector changes regularly along with time.
Linear polarizer: also called linear polarizers, or linearly polarized light sheets. Linear polarizers have the function of blocking (also known as "filtering", "blocking") and transmitting incident light, either longitudinally or transversely, and either blocked (filtered or blocked). After natural light passes through a linear polarizer, only polarized light in one direction can pass through the device, and linear polarized light is obtained.
Circular polarizer: the circular polarizer is composed of a linear polarizer and a lambda/4 phase retardation film. Further, the polarization direction of the linear polarizer is 45 degrees to the O light (or E light) of the λ/4 phase retardation film.
A phase retardation film sheet: also known as a phase retarder film, a phase retarder plate, or a wave plate. It is made of material with birefringence index, and can regulate polarization state of light beam. The wave plate has two optical axes (fast axis and slow axis) perpendicular to each other, and when light passes through the wave plate, the light is transmitted at a high speed along a certain direction, which is called fast axis, and the light is transmitted at a low speed corresponding to the vertical direction, which is called slow axis.
When the included angle between the polarization direction of incident light and the fast axis direction of the wave plate is 45 degrees, the light incident on the wave plate can be decomposed into two beams of light with the same intensity and phase but vertical polarization direction, one beam of light is parallel to the fast axis and the other beam of light is parallel to the slow axis, and the two beams of light can generate phase difference when passing through the wave plate due to the different transmission speeds of the fast axis and the slow axis, and form a beam of light again after passing through the two beams of light, but because the phases of the two beams of light are different, the new beam of light can also present different polarization states. If the phase difference is 180 °, the wave plate is called 1/2 wave plate or half-wave plate, and the polarization direction of the emergent light passing through 1/2 wave plate is perpendicular to the polarization direction of the incident light.
When the phase difference is 90 degrees, the wave plate is called an 1/4 wave plate, and the outgoing light passing through the 1/4 wave plate becomes circularly polarized light, and the circularly polarized light has no polarization direction. If the fast axes of the two 1/4 wave plates are parallel, a 1/2 wave plate can be formed, so that the circularly polarized light is converted into linearly polarized light through a 1/4 wave plate.
Referring to fig. 1, an optical sensor 10 provided in the embodiment of the present application may be presented in the form of a chip on hardware, and the chip may be directly mounted below a display screen of an electronic device without being placed below some special openings reserved outside the display area of the display screen, so that the embodiment may be applied to a full-display intelligent electronic device (that is, the display area of the front display screen of the device accounts for nearly 100%).
In this embodiment, the light sensor 10 receives ambient light transmitted through the display screen and light emitted from the display screen itself. When the received ambient light passes through the display screen, the display screen is usually not transparent, and therefore, a relatively large loss occurs. And then, in the process of reaching the optical detector through various optical devices (such as a phase delay film and a linear polarizer), although loss also exists, the loss is almost small and can be ignored. The light lost through the display screen can be calibrated in a post-compensation mode of a processor, so that the final obtained light intensity is consistent with the initial light intensity. The resulting light intensity is thus a normalized light intensity, which may be suitable for more applications based on normalized light intensity. In another embodiment, calibration may not be needed for a specific application, as long as the correspondence between the lost light intensity and a specific application is established, and the subsequent processing may be performed based on the correspondence. For example, the screen brightness is mapped to the uncalibrated light intensity that is ultimately directly detected by the light detector, and the screen is adjusted to a particular brightness at a certain light intensity.
Specifically, the light sensor 10 includes at least one light sensor sub-module 10A, and each light sensor sub-module 10A includes: a first photodetector 11, a second photodetector 12, a first linearly polarizing plate 13, a second linearly polarizing plate 14, a first phase retardation film 151, and a second phase retardation film 152. The first light detector 11 is arranged adjacent to the second light detector 12. A first linear polarizer 13 is located above the first photodetector 11; a second linear polarizer 14 is located over the second light detector 12. The first phase retardation film 151 is provided above the first linearly polarizing plate 13, and the second phase retardation film 152 is provided above the second linearly polarizing plate 14.
The first photodetector 11 is configured to obtain a first mixed light intensity after the mixed light passes through the first phase retardation film 151 and the first linear polarizer 13, where the mixed light includes a first light ray a and a second light ray B. The second light detector 12 is configured to obtain light intensity of the second mixed light after the mixed light passes through the second phase retardation film 152 and the second linear polarizer 14, after the mixed light passes through the second linear polarizer 14, the first light ray a is filtered, and a difference between the first mixed light intensity and the second mixed light intensity is light intensity of the first light ray a passing through the first phase retardation film 151 and the first linear polarizer 13. The polarization direction of the first linear polarizer 13 is consistent with the polarization direction of the first light ray a before passing through the first linear polarizer 13, and the polarization direction of the first light ray is orthogonal to the direction of the second polarizer 14.
The following description takes an optical sensor sub-module 10A as an example, specifically:
the first photodetector 11 and the second photodetector 12 may be located at the lowest position in the chip in the direction of the receiving optical path, where the receiving optical path refers to an optical path for receiving light, that is, light sequentially passes through the display screen from top to bottom, the optical path formed by the first phase retardation film 151, the first linear polarizer 13, and the first photodetector 11 (or light sequentially passes through the optical path formed by the second phase retardation film 152, the second linear polarizer 14, and the second photodetector 12 from top to bottom), and the first linear polarizer 13 is stacked above the direction of the receiving optical path of the first photodetector 11. The first linear polarizer 13 and the second linear polarizer 14 are located at the same layer, i.e. at the same horizontal plane, although the height of the first linear polarizer 13 and the second linear polarizer 14 in the vertical direction is allowed to have a height difference. For stability, the first light detector 11 and the second light detector 12 may be connected to each other in the horizontal direction. In the vertical direction, the heights of the first and second light detectors 11, 12 are the same or allow some error. The horizontal direction is separated, and the gap can be provided or not. The intensity of the second light B obtained by the first light detector 11 is the same as the intensity of the second light B obtained by the second light detector 12. The intensity of light acquired by the first light detector 11 and the second light detector 12 produces an intensity difference. And the intensity difference is the intensity of the light that is desired to be detected. In the embodiment of the present application, the first retardation film 151 and the second retardation film 152 are integrally formed, i.e., a one-piece structure. Of course, the first phase retardation film 151 and the second phase retardation film 152 are separately laminated on the first linearly polarizing plate 13 and the second linearly polarizing plate 14, respectively.
In this embodiment, the first phase retardation film 151 and the second phase retardation film 152 are λ/4 phase retardation films (or 1/4 wave plates), and the fast axes of the two phase retardation films have the same direction, so that the two linearly polarized light beams (a1, a2) coming out after the circularly polarized light passing through the display screen passes through the two phase retardation films have the same polarization direction.
Referring to fig. 2A, a light conversion and direction graph in the present embodiment is shown, and the embodiment takes the example of detecting the brightness of the display screen affected by the ambient light through the optical sensor. Ambient light with non-polarized light property forms mixed light with light (non-polarized light) in the display screen after passing through the display screen R, and the mixed light is light which passes through the display screen and does not enter the light detector. The display screen is provided with a linear polarizer and a phase retardation film (also a lambda/4 phase retardation film), the combination of the linear polarizer and the lambda/4 phase retardation film in the display screen is equivalent to a circular polarizer, and ambient light with non-polarized light property enters the display screen (passes through the linear polarizer and the phase retardation film in the display screen) and is converted into circularly polarized light (A), that is, mixed light comprises light with circular polarization property, namely, first light ray A and light with non-polarized property (lamp light), namely, second light ray B. The mixed light obtained by the first light detector 11 and the second light detector 12 is the same light with the same property and the same brightness.
In this embodiment, the first light ray a with circular polarization property passes through the first phase retardation film 151 and is converted into the first linearly polarized light ray a1 with the same polarization direction as that of the first linearly polarized light sheet 13, and the first linearly polarized light ray a1 passes through the first linearly polarized light sheet 13 without changing the polarization property and is obtained by the first light detector 11. Meanwhile, the first light ray a passes through the second phase retardation film 152 and is converted into a second linearly polarized light ray a2 orthogonal to the polarization direction of the second linearly polarized light plate 14, and the polarization direction of the linearly polarized light ray is orthogonal to the polarization direction of the second linearly polarized light plate 14, so that the second linearly polarized light ray a2 is filtered (or "shielded" or "blocked", that is, the second linearly polarized light ray a2 cannot pass through the second linearly polarized light plate 14) when passing through the second linearly polarized light plate 14; the first linearly polarized light a1 and the second linearly polarized light a2 are lights of which the first light ray a has converted polarization direction, and the light intensity is the same as the intensity of the first light ray a entering the light sensor, that is, the light intensity is unchanged before and after the conversion. The second light B is unpolarized light generated by a backlight of the display screen, and the second light B does not undergo polarization conversion through the first phase retardation film 151, and then passes through the first linear polarizer 13 to form third linearly polarized light B1, which is obtained by the first light detector 11; the second light ray B passes through the second phase retardation film 152 and then is acquired by the second photodetector 12 through the fourth linearly polarized light B2 formed by the second linearly polarized sheet 14; the first mixed light comprises a first linearly polarized light A1 and a third linearly polarized light B1, and the second mixed light comprises a fourth linearly polarized light B2. The light intensity of the third linearly polarized light B1 is the same as the light intensity of the fourth linearly polarized light B2, and is actually the light of the same light after the polarization direction is converted by the second light, and the light intensity is the same as the second light, that is, the light intensity is unchanged before and after the conversion, so that the difference between the first mixed light intensity and the second mixed light intensity is the light intensity of the first linearly polarized light a1 obtained after the mixed light passes through the first phase retardation film 151 and the first linearly polarized plate 13.
The second light detector 12 is used to acquire the light intensity of the fourth linearly polarized light B2 converted by the unpolarized light through the second linearly polarized plate 14, and does not acquire the second linearly polarized light a2 converted by the first light ray a because the polarization direction of the second linearly polarized light a2 is orthogonal to the polarization direction of the second linearly polarized plate 14. The first linearly polarized light A1 is the same as the second linearly polarized light A2, that is, the first linearly polarized light plate 13 is orthogonal to the second linearly polarized light plate 14 in polarization direction.
The utility model provides an optical sensor is used for detecting the luminous intensity of external natural environment light, earlier convert ambient light and other interference light that also are the light of two different attributes into first mixed light and second mixed light, acquire first mixed light through first light detector 11, second light detector 12 acquires the second mixed light, the luminous intensity that makes first light detector 11 second light detector 12 acquire produces intensity difference, the intensity difference is extracted in the rethread processing, also be the luminous intensity of the first light A of ambient light conversion. Therefore, the intensity of other light except the natural environment light acquired by the light sensor can be prevented from being output, and the detection result is prevented from being inaccurate due to interference.
Referring to fig. 2B, in another embodiment, the fast axes of the two phase retardation films (151, 152) may also be orthogonal (perpendicular) to each other, so that the polarization directions of the two linearly polarized light beams a1 and a2 after the first light beam a (circularly polarized light) passes through the two phase retardation films (151, 152) are orthogonal.
Accordingly, the polarization directions of the two linear polarization plates (13, 14) are set to be the same at this time, and are orthogonal to the direction of one of the linear polarization plates, so that one of the linear polarization plates can be filtered. For example, as shown in fig. 2B, the polarization directions of the two linearly polarized plates (13, 14) are the same as the direction of the first linearly polarized light a1, so that the a2 is filtered out by the second linearly polarized plate 14 since the second linearly polarized light a2 is orthogonal to the polarization direction of the a 1. The rest of the optical paths and the corresponding processing can be referred to the description of fig. 2A, and are not described herein again.
As shown in fig. 1, the optical sensor further includes a processor 10B, and the processor 10B is configured to obtain a sum of intensities of the first light ray a and the second light ray B detected by the first optical detector 11 and a light intensity of the second light ray B detected by the second optical detector 12, and output a difference between a light intensity signal of the first optical detector 11 and a light intensity signal detected by the second optical detector 12, that is, a light intensity signal of the first light ray a, that is, a converted light intensity of the first linearly polarized light a 1. The processor 10B may be integrated into the light sensor, located at the side or bottom of the first light detector 11 and the second light detector 12, and may be carried by a circuit board and connected to the first light detector 11 and the second light detector 12. The processor 10B includes a reading module, a calculating module, and an output module, where the reading module reads the light intensity values of the first light detector 11 and the second light detector 12, and outputs the light intensity values to the calculating module to calculate the light intensity difference, and then outputs the light intensity difference through the output module.
As shown in fig. 8, the light sensor sub-modules are arranged in a matrix, and the first light detectors 11 and the second light detectors 12 are arranged in a staggered manner in the matrix formed by the light sensor sub-modules. The multiple optical sensor sub-modules may or may not be connected to each other. As shown, one second photo-detector 12 is disposed at one side of each first photo-detector 11, and there are no two first photo-detectors 11 or second photo-detectors 12 in the same horizontal or vertical row in succession. The plurality of first photo detectors 11 and the plurality of second photo detectors 12 are arranged in a matrix. Of course, the arrangement is not limited to the embodiment, as long as the ambient light can be detected uniformly. The light intensity sensed by the light detector is the sum of the light intensities of the first light ray a, i.e. the ambient light, detected by the plurality of light sensor sub-modules.
Referring to fig. 3 and 4, in another embodiment of the present invention, the first light ray a in the mixed light is linearly polarized light, and the first light ray a can be formed by converting unpolarized light through a light emitter, such as a light emitter having a polarizer, and the unpolarized light in this embodiment refers to natural ambient light, such as sunlight. The second light B is unpolarized light, such as lamp light or unpolarized light in an unnatural environment, and the first phase retardation film 151 and the second phase retardation film 152 are not required in this embodiment. The second ray B is converted into linearly polarized light after passing through the first and second linearly polarizing plates 13 and 14. And the polarization property of the second light ray B passing through the first linear polarizer 13 is unchanged, and the polarization direction of the second light ray B passing through the second linear polarizer 14 is orthogonal to the polarization direction of the second light ray B passing through the first linear polarizer 13. The first photodetector 11 obtains the light intensity of the first polarized light of the first ray a passing through the first linear polarizer 13 and the third polarized light converted by the second ray B passing through the first linear polarizer 11. The first light ray a is filtered when passing through the second linear polarizer 14, the second light detector 12 only obtains the light intensity of the second polarized light formed by the second light ray B converted by the second linear polarizer 14, the light intensity values obtained by the first light detector 11 and the second light detector 12 generate an intensity difference, and the output light intensity value is the intensity of the first light ray a1 passing through the first linear polarizer 11.
Referring to fig. 5, the present application relates to a terminal device 100, which is a mobile phone, a tablet computer, or a wearable device with a screen. In this embodiment, a mobile phone is taken as an example. The display device comprises a display 30, a processor 35 (for example, a high-pass cellon series CPU chip, or a Haisinglin series chip) and an optical sensor 10 disposed below the display 30, wherein the display 30 comprises a phase retardation film 31, a linear polarizer 32 and a transparent cover 33 stacked in sequence, ambient light passes through the transparent cover 33, the linear polarizer 32, the phase retardation film 31 and the display 30 and is converted into a first light ray a, the display 30 has a light of a second light ray B, the first light ray a and the second light ray B are mixed light, detected by the light detector, the processor 10B of the light sensor is used to obtain the sum of the intensities of the first light and the second light of the first light detector 11, and the light intensity of the second light of the second photodetector 12, and outputs a difference value between the light intensity of the first photodetector and the light intensity detected by the second photodetector. The light sensor outputs the light intensity of the ambient light to the terminal device to adjust the brightness of the display screen.
The terminal device further includes a circuit board 36, the processor 35 is disposed on the circuit board 36, the sensor chip may not have a processor when the sensor 10 is packaged into a chip, and the processing function of the sensor chip may be implemented by the processor 10, that is, it can be considered that the processor 35 of the mobile phone logically has a function module 10B to specially process data of the optical sensor (for example, obtain a light intensity value, perform calibration, and the like), specifically, the processor 10 may implement the function of the function module 10B through a special hardware circuit (such as FPGA, ASIC), or may implement the function of the function module 10B in a software manner based on a general-purpose CPU core.
In another embodiment, as shown in fig. 7, 10B may also be disposed inside the sensor chip, that is, the processing function module 10B is packaged together with other components of the sensor, and finally, the processed result is directly output to the processor 35 of the terminal.
In this embodiment, the display screen is an OLED display (in other embodiments, other types of displays, such as an LED display screen, may also be used). The phase retardation film 31 is a phase retardation film having the same properties as the first phase retardation film 151 and the second phase retardation film 152, and in the present embodiment, the phase retardation film 31 and the phase retardation films 151 and 152 are both λ/4 phase retardation films.
Referring to fig. 6, when the brightness of the mobile phone screen needs to be adjusted, the light sensor detects whether the light of the using environment is enough, when the ambient light passes through the display 30, the unpolarized light is converted into circularly polarized light, and the circularly polarized light and the LED light of the display form mixed light, which enters the light sensor, the mixed light passes through the first phase retardation film 151, the second phase retardation film 152, the first linear polarizer 13 and the second linear polarizer 14, and is finally obtained by the first light detector 11 and the second light detector 12, and a light intensity difference is generated, where the light intensity difference is just the light intensity value of the ambient light. And the processor is used for processing the light intensity difference to obtain the light intensity difference and outputting the light intensity difference to the circuit board, so that the influence of light is removed, and reduction calibration is carried out according to the integral transmittance of the OLED display to realize appropriate adjustment of screen brightness. The used optical sensor can be used for lifting a screen of a mobile phone or wearable equipment and the like to adjust experience in a self-adaptive mode according to ambient light.
It will be understood by those skilled in the art that all or part of the processes (e.g., calibrating data, performing specific application operations such as adjusting light intensity based on the calibrated data) of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The objects, technical solutions and advantages of the present application are described in further detail by referring to the preferred embodiments, it should be understood that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (12)
1. A light sensor comprising at least one light sensor sub-module, each of said light sensor sub-modules comprising a first light detector, a second light detector, a first linear polarizer, a second linear polarizer, a first phase retardation film, and a second phase retardation film, wherein:
the first light detector and the second light detector are arranged adjacently;
the first linear polarizer is positioned above the first light detector;
the second linear polarizer is positioned above the second photodetector,
the first phase delay film is positioned above the first linear polarizer;
the second phase delay diaphragm is positioned above the second linear polarizer;
the first optical detector is configured to obtain light intensity of first mixed light after the mixed light passes through the first phase retardation film and the first linear polarizer, and the second optical detector is configured to obtain light intensity of second mixed light after the mixed light passes through the second phase retardation film and the second linear polarizer, where the mixed light includes a first light ray and a second light ray, and after the mixed light passes through the second linear polarizer, the first light ray is filtered, so that a difference between the light intensity of the first mixed light and the light intensity of the second mixed light is the light intensity of the first light ray after the first light ray passes through the first retardation film and the first linear polarizer.
2. The light sensor of claim 1,
a fast axis direction of the first phase retardation film coincides with a fast axis direction of the second phase retardation film; or the slow axis direction of the first phase retardation film coincides with the slow axis direction of the second phase retardation film;
the polarization direction of the first linear polarizer is consistent with the polarization direction of first linearly polarized light obtained after the first light passes through the first phase delay membrane, and the polarization direction of the first light is orthogonal to the polarization direction of the second polarizer.
3. The light sensor of claim 1,
a fast axis direction of the first phase retardation film is orthogonal to a fast axis direction of the second phase retardation film; or the slow axis direction of the first phase retardation film is orthogonal to the slow axis direction of the second phase retardation film;
the polarization direction of the first linear polarizer is consistent with the polarization direction of first linearly polarized light obtained after the first light passes through the first phase delay membrane, and the polarization direction of the first light is consistent with the polarization direction of the second polarizer.
4. A light sensor as claimed in any one of claims 1 to 3, characterized in that the first light is circularly polarized light formed by ambient light passing through a display screen provided with a circularly polarizing plate;
the second light is light emitted by a light emitting component of the display screen.
5. The optical sensor according to any one of claims 1 to 4, wherein the first phase retardation film is formed integrally with the second phase retardation film or formed separately.
6. The optical sensor of any of claims 1-5, wherein:
the first phase retardation film and the second phase retardation film are both 1/4 wave plates.
7. The light sensor of any one of claims 1-6, wherein the light sensor sub-modules are plural and arranged in a matrix, and wherein the plural light sensor sub-modules form a matrix in which the first light detectors are staggered from the second light detectors.
8. The light sensor of any one of claims 1-7, wherein: the optical sensor further comprises a processor, and the processor is used for acquiring the sum of the intensities of the first light and the second light of the first optical detector and the light intensity of the second light of the second optical detector, and outputting the difference value of the light intensity of the first optical detector and the light intensity detected by the second optical detector.
9. The light sensor of claim 8, wherein the processor is disposed on a side or bottom of the first light detector or the second light detector, or is connected to the light sensor through a circuit board.
10. A terminal device comprising a display screen including a phase retardation film, a linear polarizer and a transparent cover plate, wherein the display screen further comprises the optical sensor according to any one of claims 1 to 9, wherein the mixed light is a mixture of a first light beam of ambient light passing through the display screen and a second light beam of the display screen itself, and the optical sensor outputs the light intensity of the ambient light to the terminal device to adjust the brightness of the display screen.
11. The terminal device of claim 10, wherein the light sensor further comprises a processor configured to obtain a sum of intensities of the first light and the second light of the first light detector and a light intensity of the second light detector, and output a difference between the light intensity of the first light detector and the light intensity detected by the second light detector.
12. The terminal device of claim 11, wherein the terminal device comprises a circuit board, the processor is disposed on the circuit board, or the processor is disposed within the light sensor.
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| CN201711083552.3A CN109425427A (en) | 2017-08-22 | 2017-11-07 | Optical sensor and terminal device |
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Families Citing this family (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112133723A (en) * | 2019-06-24 | 2020-12-25 | 南昌欧菲生物识别技术有限公司 | Photosensitive module, display device and electronic equipment |
| CN112449034A (en) * | 2019-08-30 | 2021-03-05 | 北京小米移动软件有限公司 | Mobile terminal |
| KR102194096B1 (en) * | 2019-08-30 | 2020-12-22 | 베이징 시아오미 모바일 소프트웨어 컴퍼니 리미티드 | Mobile terminal |
| CN112489603B (en) * | 2019-09-11 | 2022-03-11 | 北京小米移动软件有限公司 | Electronic device, display control method, and readable storage medium |
| CN112629655A (en) * | 2019-10-09 | 2021-04-09 | 北京小米移动软件有限公司 | Mobile terminal |
| CN111868563B (en) * | 2020-01-15 | 2022-10-28 | 杭州芯格微电子有限公司 | Sensor at lower part of display |
| US11867538B2 (en) | 2020-01-15 | 2024-01-09 | Hangzhou Single Micro Electronic Co., Ltd. | Lower display sensor |
| US11423864B2 (en) * | 2020-01-21 | 2022-08-23 | Hangzhou Single Micro Electronic Co., Ltd. | Under-display sensor |
| WO2021217308A1 (en) * | 2020-04-26 | 2021-11-04 | 杭州芯格微电子有限公司 | Color and illuminance sensor under display |
| CN111670346A (en) * | 2020-01-21 | 2020-09-15 | 杭州芯格微电子有限公司 | Illuminance sensor at lower part of display |
| CN112729538A (en) * | 2020-03-30 | 2021-04-30 | 义明科技股份有限公司 | Display device and ambient light sensor thereof |
| CN111337124B (en) * | 2020-04-20 | 2022-08-05 | 北京小米移动软件有限公司 | Terminal device and ambient light detection method |
| CN111489718B (en) * | 2020-05-21 | 2021-10-22 | 北京小米移动软件有限公司 | Terminal device and ambient light detection method |
| CN111366242B (en) * | 2020-05-27 | 2020-09-04 | 北京小米移动软件有限公司 | Ambient light detection device and terminal device |
| GB202008691D0 (en) * | 2020-06-09 | 2020-07-22 | Ams Int Ag | Ambient light sensing |
| CN111833829B (en) * | 2020-07-24 | 2022-05-17 | Oppo（重庆）智能科技有限公司 | Method and device for acquiring ambient light sensitivity value, electronic equipment and readable storage medium |
| CN111933665B (en) * | 2020-08-05 | 2023-04-07 | 维沃移动通信有限公司 | Display module and electronic equipment |
| CN111917906A (en) * | 2020-08-05 | 2020-11-10 | 维沃移动通信有限公司 | Electronic device |
| CN111933027A (en) * | 2020-08-05 | 2020-11-13 | 维沃移动通信有限公司 | Display module and electronic equipment |
| CN111964778A (en) * | 2020-08-21 | 2020-11-20 | 深圳市汇顶科技股份有限公司 | Under-screen environment optical sensor and terminal equipment |
| CN111968601B (en) * | 2020-08-28 | 2022-03-01 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968602B (en) * | 2020-08-28 | 2022-03-25 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968599B (en) * | 2020-08-28 | 2022-02-22 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968600B (en) * | 2020-08-28 | 2022-03-25 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968604B (en) * | 2020-08-28 | 2022-01-07 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111969026A (en) * | 2020-08-28 | 2020-11-20 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and ambient light detection method |
| CN111968603B (en) * | 2020-08-28 | 2022-01-07 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN112082644A (en) * | 2020-09-14 | 2020-12-15 | 深圳市汇顶科技股份有限公司 | Under-screen environment optical sensor and terminal equipment |
| KR102228641B1 (en) | 2020-09-25 | 2021-03-17 | (주)에프비지코리아 | Measuring system using fbg sensor |
| CN112364797A (en) * | 2020-11-18 | 2021-02-12 | 杭州芯格微电子有限公司 | Fingerprint sensor and method for improving contrast of fingerprint image by using same |
| CN112257636A (en) * | 2020-10-29 | 2021-01-22 | 杭州芯格微电子有限公司 | Fingerprint sensor |
| TW202246737A (en) | 2021-02-02 | 2022-12-01 | 瑞士商羅立克科技股份公司 | Method of generating a spatially limited film stack on a light sensor element |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003188467A (en) * | 2001-12-20 | 2003-07-04 | Mitsubishi Electric Corp | Optical semiconductor module |
| US7714265B2 (en) | 2005-09-30 | 2010-05-11 | Apple Inc. | Integrated proximity sensor and light sensor |
| CN101951445B (en) | 2010-10-09 | 2013-01-23 | 华为终端有限公司 | Adaptive adjusting terminal equipment and method |
| GB201022138D0 (en) * | 2010-12-31 | 2011-02-02 | Barco Nv | Display device and means to measure and isolate the ambient light |
| CN202135360U (en) * | 2011-05-27 | 2012-02-01 | 吴广毅 | Device for controlling light by natural light and capable of resisting non-natural-light interference |
| US9612152B2 (en) * | 2013-11-07 | 2017-04-04 | Apple Inc. | Ambient light sensor with internal light cancellation |
| CN106462339B (en) | 2015-09-28 | 2020-09-25 | 华为技术有限公司 | Terminal and method for detecting ambient light brightness |
| US10823617B2 (en) * | 2018-09-05 | 2020-11-03 | Datalogic Ip Tech S.R.L. | Method and system for detecting polarized light emitted by electronic displays |
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- 2017-11-07 CN CN201711083552.3A patent/CN109425427A/en active Pending
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| EP3671146A4 (en) | 2020-08-12 |
| KR20200042518A (en) | 2020-04-23 |
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